Separated initialize and re-initialize of DM control block

Use Case: Turning ON Bluetooth failed after network reset

Steps:
1. Turn ON Bluetooth
2. Go to settings->backup and restore->network reset.
3. Do reset to reset BT, WIFI, data.
4. Go back to Bluetooth settings menu and try to turn ON Bluetooth.

Failure: Bluetooth is not turning ON after network reset

Root Cause: In case BTA_SYS_HW_OFF_EVT event, alarm_new is getting called.
Which is causing issue in Next Turn ON of Bluetooth if PID is same.

Fix: Separated initialize and re-initialize of DM control block

Test: code compilation.

Change-Id: I09abfb22c67f04626564a7791e4b61ec3a523cc1